diffbas: add man page.

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+.\" Man page generated from reStructuredText.
+.
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
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+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.TH "DIFFBAS" 1 "2024-07-13" "0.2.1" "Urchlay's Atari 8-bit Tools"
+.SH NAME
+diffbas \- Show differences between two tokenized Atari 8-bit BASIC files
+.SH SYNOPSIS
+.sp
+diffbas [\fIdiff\-options\fP] [\fB\-\-\fP \fIlistbas\-options\fP] \fIfile1\fP \fIfile2\fP
+.SH DESCRIPTION
+.sp
+\fBdiffbas\fP shows the differences between two tokenized (SAVEd)
+Atari BASIC programs, using \fBlistbas\fP(1) and \fBdiff\fP(1).
+.SH OPTIONS
+.sp
+\fBdiffbas\fP takes no options of its own. It will pass options as\-is
+to both \fBlistbas\fP and \fBdiff\fP\&. Use \fB\-\-\fP to separate them: everything
+before \fB\-\-\fP is passed to \fBdiff\fP, and everything between \fB\-\-\fP and
+the first filename is passed to \fBlistbas\fP\&.
+.SH EXAMPLE
+.INDENT 0.0
+.INDENT 3.5
+.sp
+.nf
+.ft C
+$ diffbas \-u A.BAS B.BAS
+
+\-\-\- A.BAS.lst 2024\-07\-12 23:56:46.937965855 \-0400
++++ B.BAS.lst 2024\-07\-12 23:56:46.938965854 \-0400
+@@ \-1,3 +1,4 @@
+ 10 ? "THIS LINE IS IN BOTH PROGRAMS."
+ 20 ? "THIS LINE IS ALSO IN BOTH."
++25 ? "THIS LINE ONLY IN B.BAS!"
+ 30 END
+.ft P
+.fi
+.UNINDENT
+.UNINDENT
+.SH EXIT STATUS
+.sp
+0 for success. On failure, the exit status is that of whichever command
+failed (\fBlistbas\fP or \fBdiff\fP).
+.SH COPYRIGHT
+.sp
+WTFPL. See \fI\%http://www.wtfpl.net/txt/copying/\fP for details.
+.SH AUTHOR
+.INDENT 0.0
+.IP B. 3
+Watson <\fI\%urchlay@slackware.uk\fP>; Urchlay on irc.libera.chat \fI##atari\fP\&.
+.UNINDENT
+.SH SEE ALSO
+.sp
+\fBa8cat\fP(1),
+\fBa8eol\fP(1),
+\fBa8xd\fP(1),
+\fBatr2xfd\fP(1),
+\fBatrsize\fP(1),
+\fBaxe\fP(1),
+\fBblob2c\fP(1),
+\fBblob2xex\fP(1),
+\fBcart2xex\fP(1),
+\fBcxrefbas\fP(1),
+\fBdasm2atasm\fP(1),
+\fBdiffbas\fP(1),
+\fBdumpbas\fP(1),
+\fBf2toxex\fP(1),
+\fBfenders\fP(1),
+\fBlistbas\fP(1),
+\fBprotbas\fP(1),
+\fBrenumbas\fP(1),
+\fBrom2cart\fP(1),
+\fBunmac65\fP(1),
+\fBunprotbas\fP(1),
+\fBvxrefbas\fP(1),
+\fBwhichbas\fP(1),
+\fBxex1to2\fP(1),
+\fBxexamine\fP(1),
+\fBxexcat\fP(1),
+\fBxexsplit\fP(1),
+\fBxfd2atr\fP(1),
+\fBxex\fP(5),
+\fBatascii\fP(7).
+.sp
+Any good Atari 8\-bit book: \fIDe Re Atari\fP, \fIThe Atari BASIC  Reference
+Manual\fP,  the  \fIOS Users\(aq Guide\fP, \fIMapping the Atari\fP, etc.
+.\" Generated by docutils manpage writer.
+.
diff --git a/diffbas.rst b/diffbas.rst
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+=======
+diffbas
+=======
+
+--------------------------------------------------------------
+Show differences between two tokenized Atari 8-bit BASIC files
+--------------------------------------------------------------
+
+.. include:: manhdr.rst
+
+SYNOPSIS
+========
+
+diffbas [*diff-options*] [**--** *listbas-options*] *file1* *file2*
+
+DESCRIPTION
+===========
+**diffbas** shows the differences between two tokenized (SAVEd)
+Atari BASIC programs, using **listbas**\(1) and **diff**\(1).
+
+OPTIONS
+=======
+**diffbas** takes no options of its own. It will pass options as-is
+to both **listbas** and **diff**. Use **--** to separate them: everything
+before **--** is passed to **diff**, and everything between **--** and
+the first filename is passed to **listbas**.
+
+EXAMPLE
+=======
+
+::
+
+  $ diffbas -u A.BAS B.BAS
+
+  --- A.BAS.lst	2024-07-12 23:56:46.937965855 -0400
+  +++ B.BAS.lst	2024-07-12 23:56:46.938965854 -0400
+  @@ -1,3 +1,4 @@
+   10 ? "THIS LINE IS IN BOTH PROGRAMS."
+   20 ? "THIS LINE IS ALSO IN BOTH."
+  +25 ? "THIS LINE ONLY IN B.BAS!"
+   30 END 
+
+EXIT STATUS
+===========
+0 for success. On failure, the exit status is that of whichever command
+failed (**listbas** or **diff**).
+
+.. include:: manftr.rst